Wikipedia
The Bellonids (, , ), sometimes called the Bellonid Dynasty, were the counts descendant of the Goth Belló who ruled in Carcassonne, Urgell, Cerdanya, County of Conflent, Barcelona, and numerous other Catalan and Septimanian counties and marches in the 9th and 10th centuries. His most famous grandson was Wilfred the Hairy, who founded the House of Barcelona, rulers of the County of Barcelona from 878, and since 1164 the Crown of Aragon, until the end of the reign of Martin the Humane in 1410.
In the early years of the 10th century all of the eastern counties of the Spanish March, and the counties of County of Conflent, Carcassonne and Razès of the March of Gothia, were ruled by Belló's descendants. This would have favored the co-ruling of some territories, and a clan-like network of mutual support, although they would have also been exposed to the risk of endogamy.
The term "Bellonids" has been used by Catalan historians, English historians (in 1871) and French historians.